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Semtech Corporation SCF12500
- Part No.:
- SCF12500
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
SCF12500.pdf
- Description:
- DIODE GP 12.5KV 500MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,959
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Product details
Overview
SCF12500 from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the SCF12500 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and validated alternatives for 22V bus protection where low-voltage clamping and thermal robustness are critical.
Technical Context
The SCF12500 uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A (8/20μs) due to decreasing RDS(on) under surge conditions.
It operates over −40°C to +125°C with stable 27.5–28V clamping at rated IPP and maintains <600nA reverse leakage at 22V VRWM. Its functional architecture enables reliable protection of USB PD VBUS and load switch inputs without thermal derating penalties typical of junction-based TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD VBUS and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements. |
| Dynamic Resistance | 20mΩ - ensures minimal IR drop during surge conduction, preserving clamping accuracy. |
| Junction Capacitance | 175pF at 22V - compatible with DC-coupled 22V power rails; not intended for high-speed data lines. |
Pinout & Package
SCF12500 is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required). All six terminals must be connected for full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path; all three pins must be soldered to maximize surge current handling and minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., USB PD VBUS); parallel connection ensures uniform current sharing and optimal clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across 24–40A and −40°C to +125°C - eliminates thermal derating and simplifies worst-case margining. |
| FET-based shunt architecture | Surge-rated MOSFET + precision trigger circuit - avoids junction heating failure modes of standard TVS diodes. |
| Low dynamic resistance | 20mΩ - minimizes voltage overshoot during fast-rising transients and improves energy diversion efficiency. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in motor drives and PLCs. |
Applications
| USB Type-C Power Delivery | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C receptacles supporting up to 100W PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector, clamping surges before reaching PD controller IC. Use Value: Maintains 28V clamping at 40A and 125°C - prevents latch-up or gate oxide damage in PD controllers like FUSB302 or TUSB73x. |
Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage stress on the load switch's internal FET during lightning-induced surges. Use Value: Clamps to ≤28V regardless of ambient temperature - avoids overvoltage failure of 30V-rated load switch FETs under industrial thermal conditions. |
| IoT Edge Node Power Rails | Storage Device 22V Backup Supplies |
Use Scenario: Securing 22V auxiliary power inputs in battery-backed IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone EOS suppressor on DC input rail, operating without bias or control signals. Use Value: Zero quiescent current and no enable logic - ideal for always-on, ultra-low-power edge nodes requiring maintenance-free surge resilience. |
Use Scenario: Protecting 22V supercapacitor or LiFePO₄ backup supplies in enterprise SSDs and NAS enclosures. IC Role / Device Role / Timing Role: Low-leakage (≤600nA at 22V) protector ensuring minimal self-discharge during long-term storage. Use Value: 130–600nA reverse leakage at VRWM - preserves backup charge integrity over months while delivering 40A surge capability on demand. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, same DFN-6 package, identical marking code "T22" - confirmed pin-to-pin and functionally identical replacement. | Same USB PD, load switch, and industrial 22V rail use cases; fully interchangeable in layout and BOM. | Select TDS2211P when sourcing from Semtech-authorized distributors with traceable lot history. |
| SP1003-220K | 22V working voltage, ±30kV ESD, but uses silicon avalanche TVS architecture - clamping rises to ~38V at 40A/125°C vs. SCF12500's stable 28V. | Suitable only where thermal margin allows higher clamping; not recommended for high-temp load switch protection. | Choose SP1003-220K only if cost sensitivity outweighs clamping stability requirements and ambient operation stays ≤25°C. |
Compared with TDS2211P, SCF12500 offers identical performance and fit; compared with SP1003-220K, SCF12500 provides 10V lower clamping at full surge and temperature range - critical for protecting 30V-rated FETs in hot industrial environments.
Availability
SCF12500 is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply with guaranteed long-term availability.
Supply support for SCF12500 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The SCF12500 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection where clamping stability over temperature and current is non-negotiable.
FAQ
What is the exact package type and footprint for SCF12500?
The SCF12500 uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed pad (no thermal pad required). Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. Land pattern matches Semtech's standard DFN-6 outline with 0.5mm pitch and 0.3mm pad width.
Does SCF12500 require any external bias or control signals to operate?
No, the SCF12500 is a passive, self-triggering device. It requires no enable pin, supply voltage, or configuration. The internal precision trigger circuit activates the shunt FET automatically when transient voltage exceeds breakdown threshold - making SCF12500 ideal for always-on, zero-quiescent-current applications.
How does SCF12500's clamping behavior differ from standard TVS diodes at elevated temperature?
Unlike standard TVS diodes whose clamping voltage increases linearly with temperature and peak current, the SCF12500 maintains 27.5–28V clamping from −40°C to +125°C at 40A. This stability arises from its FET-based architecture, where RDS(on) decreases under surge, counteracting thermal drift - a key advantage for industrial and automotive under-hood designs.
Can SCF12500 be used on high-speed data lines such as USB SuperSpeed or PCIe?
No, the SCF12500 is not suitable for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on differential pairs. It is designed exclusively for DC-coupled power or low-frequency I/O lines (e.g., USB PD VBUS, CC, SBU, or load switch inputs), not for data lanes requiring sub-0.5pF capacitance.
What is the maximum continuous reverse leakage current of SCF12500 at its working voltage?
The SCF12500 exhibits a maximum reverse leakage current of 600nA at 22V reverse stand-off voltage (VRWM) and 25°C, rising to ≤900nA across its full −40°C to +125°C operating range. This ultra-low leakage ensures minimal impact on battery-backed or energy-harvesting systems where standby current is critical.
SCF12500 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 12500 V
- Current - Average Rectified (Io):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 15 V @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 150 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 12500 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -55°C ~ 150°C
SCF12500 FAQ
1.How can I place an order for SCF12500 through Aetrix?
Please submit a Request for Quotation (RFQ) for SCF12500 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SCF12500 reliable?
The price and inventory of SCF12500 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCF12500 is usually 5 days.
3.What payment methods are accepted for SCF12500?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCF12500 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCF12500?
SCF12500 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCF12500 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SCF12500?
For technical support, including SCF12500 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCF12500 requirements.
6.How does Aetrix verify that SCF12500 is sourced from the original manufacturer or authorized distributors?
All SCF12500 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SCF12500 meets industry standards.
7.What is the process for return or replacement of SCF12500?
All SCF12500 units undergo pre-shipment inspection (PSI). If there is an issue with SCF12500, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SCF12500 part is unused and in its original packaging.
Return procedure for SCF12500:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SCF12500 Tags
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